Synthesis of NaA zeolite used as adsorbent from kaolin
Zeolite NaA was successfully synthesized by hydrothermal method using kaolin as a combined source for silica and alumina. In this work, zeolite NaA with high static water adsorption was synthesized from the low-cost raw material kaolin and the reaction parameters were optimized. Metakaolin was obtained by calcining kaolin at temperatures ranged from 953 K to 1173 K. The synthesis mixture was pre-crystallized at 343 K and crystallized at 373 K successively. Zeolite NaA was obtained, which was confirmed by SEM, XRD and the water adsorption analysis. The optimized metakaolinization temperature was found at 973 K. The influence of Na2O/SiO2 molar ratio 、pre-crystallization time and seed on the crystallization of NaA zeolite was investigated. A thorough mixing of metakaolin and NaOH solution was favourable for the nucleation/crystallization rate. The obtained NaA zeolite under the optimized conditions without any seed showed an excellent crystallinity and static water adsorption of 28.0 wt.%, which was higher than 25.9 wt.% of the commercial NaA zeolite. Kaolin was suggested to be a feasible and economical raw material for practical industrial application of NaA zeolite.
NaA zeolite kaolin hydrothermal synthesis static water adsorption
Qian Miao Zhi Hui Zhou Jian Hua Yang Jin Ming Lu Shi Wei Yan Jin Qu Wang
State Key Laboratory of Fine Chemicals, Institute of Adsorption and Inorganic Membrane, Dalian University of Technology, Dalian 116012, China
国际会议
The 12th Asian Pacific Confederation of Chemical Engineering Congress(第十二届亚太化工联盟大会暨化工展览会)
大连
英文
2008-08-04（万方平台首次上网日期，不代表论文的发表时间）